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Add 15 Horsepower In 10 Min. | Fox Body 10 Minute Tune Up

Created by Jude Horstman / 10 min read
Date Created: 11/14/2022
Last Updated: 11/14/2022

Looking to get 15 extra horsepower out of your stock Fox Body Mustang? Follow along, and we'll show you what to do and the results!

Viewing this install and using the information shared is subject to the terms set forth here - View the LMR Install Instructions Disclaimer.

FOLLOW: mustang , 79 93 mustang , fox body , fox body mustang , tune , dyno

Fox Body Mustang 10 Minute Tune-Up


If you have been around the Fox Body mustang lifestyle for a while, you may have heard of the "10 Minute Tune-Up". These four easy and simple modifications can add 15 horsepower to your Mustang with some basic tools. Now, if you're new to the Fox Body platform and have never heard of this, we'll walk you through exactly what to do.

On top of that, for each modification we do, we made sure to put it back on the dyno and see the difference every time. So let's begin!

We decided to dyno our bone-stock 1993 Cobra. This car does not have any modifications whatsoever. It has the factory 17" wheels, 3.08 rear-end gears, T-5 transmission, 93 octane, and 10 degrees of timing. We'll use the numbers below to reference when modifying the Cobra.


Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up - Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up

Our 1993 Cobra made 222 HP and 281 TQ for the first pull. From here, we'll go in the order of bumping the timing, removing the air silencer from the passenger side fender, replacing the factory paper air filter with a K&N high-flow filter, and replacing the factory serpentine belt with a shorter belt. Again, we'll walk you through the details and numbers as we move on.


Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up - Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up

Bumping The Timing


This one is easy and doesn't take a lot of time at all. What you'll need is a timing light and some simple tools. If you haven't done this before, you can learn more about how to set your 5.0L Mustang timing.


After setting the timing light up, we advanced the stock timing from 10 to 14 degrees.


Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up - Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up

On the second pull, the Cobra made 226 HP and 286 TQ after the bump in timing. This was a 4 HP and 5 TQ difference from before. Now every car is different. Some cars may see more, while others may see fewer horsepower gains after advancing the timing. Let's jump into step two!


Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up - Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up

Removing The Air Silencer


We removed the factory air silencer from the Cobra on this run. Removing it is very simple and takes a couple of basic hand tools to get the job done. There are (3) nuts that hold the silencer to the fender. Remove those nuts, and the silencer will fall into the fender well. Then it can be removed through the opening between the inner fender and the fender.


Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up - Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up

Side note: we made sure to wait 20 minutes in between dyno pulls to ensure accurate horsepower readings.


Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up - Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up

On the second dyno run, we barely made 1 HP and over one lb-ft of torque. Bringing us to 226 HP and 288 TQ.


Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up - Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up

Replacing The Factory Air Filter


Replacing the air filter is one of the easiest and best modifications to your stock Fox Body Mustang. Most of y'all that own a Fox Body have done this before. If you haven't, check out full removal and installation article when upgrading your air filter.


Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up - Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up

After we waited another 20 minutes to let the car cool down, the K&N high-flow air filter brought us to 230 HP and 292 TQ! About 4-5 horsepower and lb/ft of torque increase are to be expected, but it did help! Just remember, don't expect to see 10-20 horsepower gains. These filters help the cars breathe a little better.


Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up - Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up

Installing A Shorter Serpentine Belt


This one is a cheat code for drag racers. It's a known trick, so we're sure this one will help most of y'all. When installing a shorter belt, you'll bypass the steering and smog pump on the car. These pumps are not needed for drag racing, but we highly recommend that you reinstall the original belt length if you plan to drive your Fox Body (especially if you live in an area that conducts smog tests).


Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up - Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up

Well damn! After completing all three previous steps, plus the shorter belt, this car made 237 HP and 296 TQ!


Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up - Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up

Compared to the first pull with everything stock and 10 degrees of timing, we picked up 15 horsepower &14-15 lb-ft of torque! I'm sure we can all agree that this 10-minute tune-up made a difference! If you're a Fox Body owner looking to make easy power while saving money, these mods are the way to go. It's easy and simple to do, plus you can always revert the car to stock whenever you feel like it.


Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up - Add 15 Horsepower In 10 Minutes | Fox Body 10 Minute Tune Up


Conclusion

We hope this article has helped add some extra horsepower to your Fox Body Mustang. If you need assistance with doing some of these installs, call or email our customer service team or check out our Fox Body Install playlist on our channel. We have tons of removal, install, and review videos to help you along your Fox Body Mustang journey!



About the Video

Add 15 Horsepower In 10 Min. | Fox Body 10 Minute Tune Up

Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more. The best place to go for anything Mustang related!

Published on 2020-05-19
Shop All Fox Body Parts: https://latemodelres.to/79-93Parts_10MinuteTuneUp
Fox Body Air Filters: https://latemodelres.to/79-93AirFilters
Serpentine Belts: https://latemodelres.to/79-93_Belts
Fox Body Belt Guide: https://latemodelres.to/BeltGuide

Check out the stock 1993 Cobra dyno video below!
Stock 1993 Cobra Dyno: https://youtu.be/CfhdG2rjF9g

If you own a Fox Body, increasing your horsepower is a lot easier than you think! Landan is going to show you what it takes to add up to 15 horsepower in 10 minutes with just a couple of steps!

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Due to factors beyond the control of LMR.com, we cannot guarantee against the improper use or unauthorized modifications of this information. LMR.com assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. LMR.com recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of LMR.com, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not LMR.com.
Thumbnail image of the author of this article, Jude Horstman.

About the Author

Jude is our Social Media Specialist and has written for Late Model Restoration for 4 years. Jude has a deep passion for automotive culture, including cars, trucks, and motorcycles. Read more...